[Retros] Mushikui Reconstruction (castling both sides)

[Mu-Tsun Tsai]

Here's a further improvement of my previous composition. This one now has 
both O-O and O-O-O castling, and Valladao theme on both sides!

1.** *** 2.** *** 3.** **** 4.***** ** 5.*** *** 6.** ** 7.**** ***** 8.** 
***** 9.** ***** 10.**** ***** 11.*** *** 12.***** ***** 13.**** ** 14.**** 
** 15.***** ** 16.***** *** 17.***** **** 18.**** **** 19.*** **** 20.**** 
** 21.****** ** 22.** ****** 23.**** ** 24.*** ****** 25.****** **** 26.**** 
**** 27.*****

The first 35 single moves are the same as the previous one.

This is also my first example that forces a promotion to bishop.
Promotion to queen, rook or knight have already shown up in my earlier 
compositions.
So what's next... AUW? :)

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1.e4 Nf6 2.e5 Nh5 3.e6 fxe6 4.Qxh5+ g6 5.Qa5 Bg7 6.d4 c5 7.dxc5 Qxa5+ 8.b4 
Qxb4+ 9.c3 Qxc3+ 10.Nxc3 Bxc3+ 11.Bd2 O-O 12.O-O-O Bxd2+ 13.Rxd2 e5 14.Bc4+ 
d5 15.Bxd5+ e6 16.Bxe6+ Rf7 17.Bxf7+ Kxf7 18.Rd7+ Bxd7 19.Nh3 Bxh3 20.gxh3 
b5 21.cxb6ep e4 22.f4 exf3ep 23.bxa7 f2 24.Rg1 fxg1=B 25.axb8=Q Bxh2 26.Qxh2 
Rxa2 27.Qxa2+


Mu-Tsun